2 decades is 2 decades. And, it’s not like when he gets released he’ll be hailed as a hero. Trump will be dead, most of his supporters will probably be dead of old age or COVID. The rest will be too embarrassed that they voted for him to admit it.
When he gets out he’ll be 60. Having spent decades in prison, he won’t be able to retire, and will probably live out the rest of his life working menial jobs that hire ex-felons until he dies in obscurity.